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leaf

A leaf is an organ of a vascular plant and is the principal lateral appendage of the stem. The leaves and stem together form the shoot. Leaves are collectively referred to as foliage, as in "autumn foliage". Although leaves can be seen in many different shapes, sizes and textures, typically a leaf is a thin, dorsiventrally flattened organ, borne above ground and specialized for photosynthesis. In most leaves, the primary photosynthetic tissue, the palisade mesophyll, is located on the upper side of the blade or lamina of the leaf but in some species, including the mature foliage of Eucalyptus, palisade mesophyll is present on both sides and the leaves are said to be isobilateral. Most leaves have distinctive upper surface (adaxial) and lower surface (abaxial) that differ in colour, hairiness, the number of stomata (pores that intake and output gases), epicuticular wax amount and structure and other features. Broad, flat leaves with complex venation are known as megaphylls and the species that bear them, the majority, as broad-leaved or megaphyllous plants. In others, such as the clubmosses, with different evolutionary origins, the leaves are simple, with only a single vein and are known as microphylls. Some leaves, such as bulb scales are not above ground, and in many aquatic species the leaves are submerged in water. Succulent plants often have thick juicy leaves, but some leaves are without major photosynthetic function and may be dead at maturity, as in some cataphylls and spines.
Dolomites. - Footbridge over a stream in the Dolomites.
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Dolomites.

Added yesterday by Zeta

82 1

Gesi in the spring park. - Geese on the water in the spring park.
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Gesi in the spring park.

Added 2 days ago by Zeta

47 1

Water lilies. - Water lilies in a garden pond.
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Water lilies.

Added 2 days ago by Zeta

64 2

Hotel for insects - Garden hotel for wild pollinators
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Hotel for insects

Added 2 days ago by Leo

32

Walk along the causeway. - Afternoon walk along the causeway.
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Walk along the causeway.

Added 3 days ago by Zeta

114

A canal among trees. - A channel flowing among trees.
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A canal among trees.

Added 3 days ago by Zeta

43

Bridge over the canal. - White bridge over the canal.
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Bridge over the canal.

Added 3 days ago by Zeta

70

Tree above the water. - Blooming tree above the water.
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Tree above the water.

Added 4 days ago by Zeta

57

Giszowiec - Landscape - Giszowiec
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Giszowiec

Added 5 days ago by Wiesia

128

Flowers in the clouds - Flowers, beautiful view on the clouds background
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Flowers in the clouds

Added 5 days ago by Mila

159

Landscape. - Colorful trees by the gray road.
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Landscape.

Added week ago by Grażyna

37

Ireland. - Lovely Northern Ireland.
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Ireland.

Added 8 days ago by Grażyna

196 2

New Zealand. - The beauty of New Zealand.
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New Zealand.

Added 8 days ago by Grażyna

103

Miley Cyrus - Cyrus launched her film career as a voice actress in the animated film Bolt (2008), and later starre
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Miley Cyrus

Added 9 days ago by Jeżyna

6

Backyard garden. - Backyard garden. Summer.
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Backyard garden.

Added 10 days ago by Zeta

119

park in the park - oj la la la la la la la
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park in the park

Added 11 days ago by MAJAMA

78

long way - on a bike by a road in the forest
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long way

Added 11 days ago by Mila

89

Landscape - colorful jigsaw puzzle
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Landscape

Added 13 days ago by andi

54

Landscape - colorful jigsaw puzzle
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Landscape

Added 13 days ago by andi

174 1

Pond - A blooming pond
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Pond

Added 13 days ago by Leo

28

Tree.. - A branchy tree in the park.
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Tree..

Added 2 weeks ago by Grażyna

46

Mansion with garden - colorful jigsaw puzzle
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Mansion with garden

Added 2 weeks ago by andi

68

Mansion with garden - colorful jigsaw puzzle
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Mansion with garden

Added 2 weeks ago by andi

191 1

Rural buildings - colorful jigsaw puzzle
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Rural buildings

Added 2 weeks ago by andi

44

Cottage with garden - colorful jigsaw puzzle
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Cottage with garden

Added 2 weeks ago by andi

51 1

Road among trees. - Road among trees at sunset.
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Road among trees.

Added 2 weeks ago by Zeta

123

klonowisko - brum brum brum brum brum
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klonowisko

Added 2 weeks ago by MAJAMA

21

red maple - bzium bzium, yum tra la la
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red maple

Added 2 weeks ago by MAJAMA

25

Superior Wisconsin - Superior Wisconsin. The first known inhabitants of Douglas County were the mound builders. These peo
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Superior Wisconsin

Added 2 weeks ago by Jeżyna

92

Kościół.Rzeka.Drzewa. - Church. River Trees. The best puzzle zone with nature. The best puzzle zone with nature.
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Kościół.Rzeka.Drzewa.

Added 3 weeks ago by Grażyna

322 2

Park landscape. - Park. Tree. Bench...
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Park landscape.

Added 3 weeks ago by Grażyna

53

BAJKOWY VIEW - Vacation, holidays, rest.
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BAJKOWY VIEW

Added 3 weeks ago by ada

65

BAJKOWY VIEW - Vacation, holidays, rest.
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BAJKOWY VIEW

Added 3 weeks ago by ada

21

Flower-abstraction - colorful jigsaw puzzle
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Flower-abstraction

Added 3 weeks ago by andi

27